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SubmarineMonitoring/common/plugin/map/ol/v6.5.0/examples/disable-image-smoothing.html

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海底监测与灾害预警系统管理平台界面
2 weeks ago
<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
<script>
var gaProperty = 'UA-2577926-1';
// Disable tracking if the opt-out cookie exists.
var disableStr = 'ga-disable-' + gaProperty;
if (document.cookie.indexOf(disableStr + '=true') > -1) {
window[disableStr] = true;
}
function gaOptout() {
document.cookie = disableStr + '=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
window[disableStr] = true;
}
function gaOptoutRevoke() {
document.cookie = disableStr + '=false; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
window[disableStr] = false;
}
</script>
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-2577926-1"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-2577926-1', { 'anonymize_ip': true });
</script>
<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.css" />
<script src="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.js"></script>
<script src="https://unpkg.com/lz-string@1.4.4/libs/lz-string.min.js"></script>
<script>
window.addEventListener("load", function() {
window.cookieconsent.initialise({
'palette': {
'popup': {
'background': '#eaf7f7',
'text': '#5c7291'
},
'button': {
'background': '#56cbdb',
'text': '#ffffff'
}
},
'theme': 'edgeless',
'type': 'opt-out',
'onInitialise': function (status) {
if (!this.hasConsented()) {
gaOptout()
}
},
'onStatusChange': function(status, chosenBefore) {
if (!this.hasConsented()) {
gaOptout()
}
},
'onRevokeChoice': function() {
gaOptoutRevoke()
}
})
});
</script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" type="text/css">
<link rel="stylesheet" href="./resources/prism/prism-1.20.0.css" type="text/css">
<link rel="stylesheet" href="./css/ol.css" type="text/css">
<link rel="stylesheet" href="./resources/layout.css" type="text/css">
<script src="https://unpkg.com/elm-pep"></script>
<script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,URL,TextDecoder"></script>
<link rel="stylesheet" href="disable-image-smoothing.css">
<title>Disable Image Smoothing</title>
</head>
<body>
<header class="navbar navbar-expand-sm navbar-dark mb-3 py-0" role="navigation">
<a class="navbar-brand" href="https://openlayers.org/"><img src="./resources/logo-70x70.png" alt="">&nbsp;OpenLayers</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#olmenu" aria-controls="olmenu" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<!-- menu items that get hidden below 768px width -->
<nav class="collapse navbar-collapse" id="olmenu">
<ul class="nav navbar-nav ml-auto">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="docdropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Docs</a>
<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="docdropdown">
<a class="dropdown-item" href="../doc/">Docs</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="../doc/quickstart.html"><i class="fa fa-check fa-fw mr-2 fa-lg"></i>Quick Start</a>
<a class="dropdown-item" href="../doc/faq.html"><i class="fa fa-question fa-fw mr-2 fa-lg"></i>FAQ</a>
<a class="dropdown-item" href="../doc/tutorials/"><i class="fa fa-book fa-fw mr-2 fa-lg"></i>Tutorials</a>
<a class="dropdown-item" href="/workshop/"><i class="fa fa-graduation-cap fa-fw mr-2 fa-lg"></i>Workshop</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="https://stackoverflow.com/questions/tagged/openlayers"><i class="fa fa-stack-overflow fa-fw mr-2"></i>Ask a Question</a>
</div>
</li>
<li class="nav-item active"><a class="nav-link" href="../examples/">Examples</a></li>
<li class="nav-item"><a class="nav-link" href="../apidoc/"><i class="fa fa-sitemap mr-1"></i>API</a></li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="codedropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Code</a>
<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="codedropdown">
<a class="dropdown-item" href="https://github.com/openlayers/openlayers"><i class="fa fa-github fa-fw mr-2 fa-lg"></i>Repository</a>
<a class="dropdown-item" href="/download/"><i class="fa fa-download fa-fw mr-2 fa-lg"></i>Download</a>
</div>
</li>
</ul>
</nav>
</header>
<div class="container-fluid line-numbers">
<div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">
<button id="latest-dismiss" type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
This example uses OpenLayers v<span>6.5.0</span>. The <a id="latest-link" href="#" class="alert-link">latest</a> is v<span id="latest-version"></span>.
</div>
<div class="row-fluid">
<a href="#" id="codepen-button" class="btn btn-link float-right">
<i class="fa fa-codepen fa-lg"></i> Edit
</a>
<div class="span12">
<h4 id="title">Disable Image Smoothing</h4>
<p class="tags">
<span class="badge-group">
<a
href="./index.html?q=disableimagesmoothing" class="badge badge-info">disableimagesmoothing</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="disableimagesmoothing"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./disable-image-smoothing.html&quot;&gt;Disable Image Smoothing&lt;/a&gt;"
tabindex="0"
>1</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=xyz" class="badge badge-info">xyz</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="xyz"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./xyz-esri-4326-512.html&quot;&gt;ArcGIS REST with 512x512 Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./disable-image-smoothing.html&quot;&gt;Disable Image Smoothing&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./full-screen.html&quot;&gt;Full Screen Control&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./full-screen-drag-rotate-and-zoom.html&quot;&gt;Full Screen Drag, Rotate, and Zoom&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./side-by-side.html&quot;&gt;Shared Views&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./xyz.html&quot;&gt;XYZ&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./xyz-esri.html&quot;&gt;XYZ Esri&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./xyz-retina.html&quot;&gt;XYZ Retina Tiles&lt;/a&gt;"
tabindex="0"
>8</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=maptiler" class="badge badge-info">maptiler</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="maptiler"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./zoom-constrained.html&quot;&gt;Constrained Zoom&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./disable-image-smoothing.html&quot;&gt;Disable Image Smoothing&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./drag-and-drop.html&quot;&gt;Drag-and-Drop&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./drag-and-drop-image-vector.html&quot;&gt;Drag-and-Drop Image Vector&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./full-screen.html&quot;&gt;Full Screen Control&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./full-screen-drag-rotate-and-zoom.html&quot;&gt;Full Screen Drag, Rotate, and Zoom&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./gpx.html&quot;&gt;GPX Data&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./image-filter.html&quot;&gt;Image Filters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml.html&quot;&gt;KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./layer-spy.html&quot;&gt;Layer Spy&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./layer-swipe.html&quot;&gt;Layer Swipe&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./magnify.html&quot;&gt;Magnify&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-layer.html&quot;&gt;Mapbox-gl Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-move-animation.html&quot;&gt;Marker Animation&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-osm.html&quot;&gt;OSM XML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./raster.html&quot;&gt;Raster Source&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./region-growing.html&quot;&gt;Region Growing&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./side-by-side.html&quot;&gt;Shared Views&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./street-labels.html&quot;&gt;Street Labels&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./mapbox-style.html&quot;&gt;Vector tiles created from a Mapbox Style object&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-tiles-4326.html&quot;&gt;Vector tiles in EPSG:4326&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs.html&quot;&gt;WFS&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs-getfeature.html&quot;&gt;WFS - GetFeature&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./xyz-retina.html&quot;&gt;XYZ Retina Tiles&lt;/a&gt;"
tabindex="0"
>24</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=reprojection" class="badge badge-info">reprojection</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="reprojection"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./disable-image-smoothing.html&quot;&gt;Disable Image Smoothing&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection-image.html&quot;&gt;Image Reprojection&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection-wgs84.html&quot;&gt;OpenStreetMap Reprojection&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./scaleline-indiana-east.html&quot;&gt;OpenStreetMap Reprojection with ScaleLine Control&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection.html&quot;&gt;Raster Reprojection&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection-by-code.html&quot;&gt;Reprojection with EPSG.io Search&lt;/a&gt;"
tabindex="0"
>6</a>
</span>
</p>
<div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
<div class="modal-dialog modal-dialog-scrollable" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="tag-example-title"></h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">&times;</span>
</button>
</div>
<div class="modal-body">
<div class="list-group"></div>
</div>
</div>
</div>
</div>
<div class="wrapper">
<div class="half">
<h4>Smoothing Disabled</h4>
<div id="map1" class="map"></div>
<div>
<label>
Elevation
<span id="info1">0.0</span> meters
</label>
</div>
<div>
<label>
Imagery opacity
<input id="opacity" type="range" min="0" max="100" value="80" />
<span id="output"></span> %
</label>
</div>
</div>
<div class="half">
<h4>Uncorrected Comparison</h4>
<div id="map2" class="map"></div>
<div>
<label>
Elevation
<span id="info2">0.0</span> meters
</label>
</div>
</div>
</div>
</div>
<form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
<input id="codesandbox-params" type="hidden" name="parameters">
</form>
</div>
<div class="row-fluid">
<div class="span12">
<p id="shortdesc">Example of disabling image smoothing</p>
<div id="docs"><p>Example of disabling image smoothing when using raster DEM (digital elevation model) data. The <code>imageSmoothing: false</code> setting is used to disable canvas image smoothing during reprojection and rendering. Elevation data is calculated from the pixel value returned by <b>forEachLayerAtPixel</b>. For comparison a second map with smoothing enabled returns inaccuate elevations which are very noticeable close to 3107 meters due to how elevation is calculated from the pixel value.</p>
</div>
</div>
</div>
<div class="row-fluid">
<h5 class="source-heading">main.js</h5>
<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import Map from &#x27;ol/Map&#x27;;
import TileLayer from &#x27;ol/layer/Tile&#x27;;
import View from &#x27;ol/View&#x27;;
import XYZ from &#x27;ol/source/XYZ&#x27;;
var key &#x3D; &#x27;Get your own API key at https://www.maptiler.com/cloud/&#x27;;
var attributions &#x3D;
&#x27;&lt;a href&#x3D;&quot;https://www.maptiler.com/copyright/&quot; target&#x3D;&quot;_blank&quot;&gt;&amp;copy; MapTiler&lt;/a&gt; &#x27; +
&#x27;&lt;a href&#x3D;&quot;https://www.openstreetmap.org/copyright&quot; target&#x3D;&quot;_blank&quot;&gt;&amp;copy; OpenStreetMap contributors&lt;/a&gt;&#x27;;
var disabledLayer &#x3D; new TileLayer({
// specify className so forEachLayerAtPixel can distinguish layers
className: &#x27;ol-layer-dem&#x27;,
source: new XYZ({
attributions: attributions,
url:
&#x27;https://api.maptiler.com/tiles/terrain-rgb/{z}/{x}/{y}.png?key&#x3D;&#x27; + key,
maxZoom: 10,
crossOrigin: &#x27;&#x27;,
imageSmoothing: false,
}),
});
var imagery &#x3D; new TileLayer({
className: &#x27;ol-layer-imagery&#x27;,
source: new XYZ({
attributions: attributions,
url: &#x27;https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key&#x3D;&#x27; + key,
maxZoom: 20,
crossOrigin: &#x27;&#x27;,
}),
});
var enabledLayer &#x3D; new TileLayer({
source: new XYZ({
attributions: attributions,
url:
&#x27;https://api.maptiler.com/tiles/terrain-rgb/{z}/{x}/{y}.png?key&#x3D;&#x27; + key,
maxZoom: 10,
crossOrigin: &#x27;&#x27;,
}),
});
imagery.on(&#x27;prerender&#x27;, function (evt) {
// use opaque background to conceal DEM while fully opaque imagery renders
if (imagery.getOpacity() &#x3D;&#x3D;&#x3D; 1) {
evt.context.fillStyle &#x3D; &#x27;white&#x27;;
evt.context.fillRect(
0,
0,
evt.context.canvas.width,
evt.context.canvas.height
);
}
});
var control &#x3D; document.getElementById(&#x27;opacity&#x27;);
var output &#x3D; document.getElementById(&#x27;output&#x27;);
control.addEventListener(&#x27;input&#x27;, function () {
output.innerText &#x3D; control.value;
imagery.setOpacity(control.value / 100);
});
output.innerText &#x3D; control.value;
imagery.setOpacity(control.value / 100);
var view &#x3D; new View({
center: [6.893, 45.8295],
zoom: 16,
projection: &#x27;EPSG:4326&#x27;,
});
var map1 &#x3D; new Map({
target: &#x27;map1&#x27;,
layers: [disabledLayer, imagery],
view: view,
});
var map2 &#x3D; new Map({
target: &#x27;map2&#x27;,
layers: [enabledLayer],
view: view,
});
var info1 &#x3D; document.getElementById(&#x27;info1&#x27;);
var info2 &#x3D; document.getElementById(&#x27;info2&#x27;);
var showElevations &#x3D; function (evt) {
if (evt.dragging) {
return;
}
map1.forEachLayerAtPixel(
evt.pixel,
function (layer, pixel) {
var height &#x3D;
-10000 + (pixel[0] * 256 * 256 + pixel[1] * 256 + pixel[2]) * 0.1;
info1.innerText &#x3D; height.toFixed(1);
},
{
layerFilter: function (layer) {
return layer &#x3D;&#x3D;&#x3D; disabledLayer;
},
}
);
map2.forEachLayerAtPixel(
evt.pixel,
function (layer, pixel) {
var height &#x3D;
-10000 + (pixel[0] * 256 * 256 + pixel[1] * 256 + pixel[2]) * 0.1;
info2.innerText &#x3D; height.toFixed(1);
},
{
layerFilter: function (layer) {
return layer &#x3D;&#x3D;&#x3D; enabledLayer;
},
}
);
};
map1.on(&#x27;pointermove&#x27;, showElevations);
map2.on(&#x27;pointermove&#x27;, showElevations);
</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">index.html</h5>
<pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
&lt;meta charset="UTF-8"&gt;
&lt;title&gt;Disable Image Smoothing&lt;/title&gt;
&lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
&lt;script src="https://unpkg.com/elm-pep"&gt;&lt;/script&gt;
&lt;style&gt;
.map {
width: 100%;
height:400px;
}
@media (min-width: 800px) {
.wrapper {
display: flex;
}
.half {
padding: 0 10px;
width: 50%;
float: left;
}
}
#opacity {
display: inline-block;
width: 150px;
vertical-align: text-bottom;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div class&#x3D;&quot;wrapper&quot;&gt;
&lt;div class&#x3D;&quot;half&quot;&gt;
&lt;h4&gt;Smoothing Disabled&lt;/h4&gt;
&lt;div id&#x3D;&quot;map1&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;div&gt;
&lt;label&gt;
Elevation
&lt;span id&#x3D;&quot;info1&quot;&gt;0.0&lt;/span&gt; meters
&lt;/label&gt;
&lt;/div&gt;
&lt;div&gt;
&lt;label&gt;
Imagery opacity
&lt;input id&#x3D;&quot;opacity&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;100&quot; value&#x3D;&quot;80&quot; /&gt;
&lt;span id&#x3D;&quot;output&quot;&gt;&lt;/span&gt; %
&lt;/label&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div class&#x3D;&quot;half&quot;&gt;
&lt;h4&gt;Uncorrected Comparison&lt;/h4&gt;
&lt;div id&#x3D;&quot;map2&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;div&gt;
&lt;label&gt;
Elevation
&lt;span id&#x3D;&quot;info2&quot;&gt;0.0&lt;/span&gt; meters
&lt;/label&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;script src="main.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">package.json</h5>
<pre><code id="example-pkg-source" class="language-json">{
&quot;name&quot;: &quot;disable-image-smoothing&quot;,
&quot;dependencies&quot;: {
&quot;ol&quot;: &quot;6.5.0&quot;
},
&quot;devDependencies&quot;: {
&quot;parcel&quot;: &quot;^2.0.0-beta.1&quot;
},
&quot;scripts&quot;: {
&quot;start&quot;: &quot;parcel index.html&quot;,
&quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
}
}</code></pre>
</div>
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